Vortex Spring produces 28 million gallons of crystal clear freshwater, not saltwater, and holds at a steady year-round temperature of 68 degrees. It’s located right outside Ponce de Leon, Florida. Yet instead of the famed Fountain of Youth, the commercial dive location is famous for teaching people how to cave dive . . . and a bit infamous for all the cave divers who have died there. We had not heard of this unusual yet beautiful piece of paradise, but we hope you find it as fascinating and mysterious as we do. From professional cave divers to curious adrenaline junkies, adventurers travel far and wide to dive the Vortex. There are more than 1,600 feet of underwater passageways. At 310 feet down, there is a locked steel gate that bars the way into the cave so the inexperienced and uncertified will not risk the underwater grim reaper. Sometimes even qualified divers get lost; sometimes they dive into the Vortex but they don’t come out. [32 Photos, 5 Videos]